Combining Xt20S And Adats; Xt20 Transport Speed; Sample Rate Vs. Pitch Control; Input Monitoring - Alesis ADAT-XT20 Reference Manual

Chapter 5: Multiple ADAT-XT20 Operation
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OMBINING
XT20 T
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AMPLE RATE VS
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XT20
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RANSPORT
The XT20's transport speed has been improved to be four times faster in
engaged mode than the original ADAT. Because of this and other
unique features, it is recommended that you make the XT20 the master
(ID 1) in your system and any ADAT(s) should be the slave(s). Until
you need more than 8 tracks, you may want to avoid inserting tape(s)
into the slave unit(s). This is because when locating, the ADATs will
move slower than the XT20. The result is the XT20 will locate to a
specific tape position, stop and wait for the ADAT(s) to get there
before going into play.
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The Clock Select function on the XT20 is another addition not found on
the original ADAT. This function allows you to instantly choose
between 48 kHz or 44.1 kHz sampling rates, as well as lets you select a
digital clock for applications involving the recording of digital audio
from a non-ADAT source). The XT20 also writes sample rate
information when formatting a tape. This way, the XT20
automatically knows which sample rate a tape was formatted with
although either sample rate may be used.
Example: When playing back a tape that was formatted at 48 kHz and
the Clock is set to 44.1 kHz, the 44.1K icon will flash, to indicate that
you are using 44.1 kHz but it isn't the original sample rate used when
the tape was formatted. The same goes when you playback a tape
formatted using 44.1 kHz with the Clock set to 48 kHz; the 48K icon
will flash.
It is important to remember that on the XT20, the Pitch Controls are
supplemental to sample rate selection. With the original ADAT, you
had to pitch down a tape in order to playback at a 44.1 kHz sample
rate. This is no longer necessary on the XT20 due to the addition of the
Clock Select function.
If you play back a tape that was formatted on an original ADAT, it
will not have any sample rate information written on it (since this is a
new feature not found in the original ADAT). The XT20 will
automatically select the 48 kHz setting in this case. Therefore, if you
had been pitching-down such a tape to play at 44.1 kHz, you must press
the [CLOCK SELECT] button to manually change the XT20's Clock to
44.1 kHz.
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ONITORING
The original ADAT was designed so that when you were monitoring a
track's input signal, what you heard was the actual analog input being
fed directly to the analog output—the signal did not pass through the
A/D and D/A converters. There was an advanced feature whereby, if
you held [SET LOCATE] and pressed [ALL INPUT], it would then allow
you to monitor the input after the converters, so as to hear exactly how
the signal would sound when played back from tape.
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ADAT XT20 Reference Manual
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